The liquid nitrogen tank is manufactured based on the vacuum jacket insulation principle invented by the British scientist Dewar in 1898, and is also called the liquid nitrogen biological container, which is a biological storage container. It scientifically solves the problem of the loss of a large amount of liquid nitrogen due to evaporation caused by heat convection, conduction and radiation in the container during liquid nitrogen storage.
 
Liquid nitrogen tank products are widely used in animal husbandry, medical treatment and scientific research, mechanical processing and other fields. Liquid nitrogen is used as a refrigerant to preserve animal semen, organs, bacteria and other biological samples, as well as cryogenic treatment of metal materials and cryogenic assembly of precision parts. Liquid nitrogen is a colorless, odorless, and extremely low-temperature substance, and its temperature is -196°C under normal pressure. The liquid nitrogen tank is made using this physical property of liquid nitrogen.
 
Liquid nitrogen tanks can be divided into transport-type liquid nitrogen tanks, storage-type liquid nitrogen tanks, self-pressurization liquid nitrogen tanks, glass-lined liquid nitrogen tanks, aerated infusion liquid nitrogen tanks and self-draining liquid nitrogen tanks according to different definition standards.
 
1. Transport-type liquid nitrogen tank
The transport-type liquid nitrogen tank usually has a special shock-proof design. In addition to static storage, it can also be used for transportation under the state of filling liquid nitrogen. Violent collisions and vibrations should be avoided.
2. Storage-type liquid nitrogen tank
The storage-type liquid nitrogen tank is mainly used for the indoor static storage of liquid nitrogen, and preservation of experimental specimens, such as tissue specimens, etc..
3. Self-pressurization liquid nitrogen tank
The self-pressurization liquid nitrogen tank is composed of an infusion valve, a bleed pressure reducing valve, a pressure increasing valve, a double safety valve, a pressure gauge, a liquid level gauge, an infusion tube, a movable caster, and the main body of the container. The working principle of the self-pressurization liquid nitrogen tank: a self-pressurizing device is installed inside the container, which uses a small amount of liquid nitrogen in the container to generate pressure, so that the container can discharge liquid nitrogen, and is used in connection with other instruments that need to be cooled.
4. Glass-lined liquid nitrogen tank
The glass-lined liquid nitrogen tank is an ideal container and tool for storing liquid gas, low temperature research and crystal element protection.
5. Aerated infusion liquid nitrogen tank
The aerated infusion liquid nitrogen tank is actually similar to the self-pressurization liquid nitrogen tank. The aerated infusion liquid nitrogen tank relies on the internal liquid nitrogen to vaporize and increase the volume to generate pressure to discharge the liquid nitrogen.
6. Self-draining liquid nitrogen tank
The self-draining liquid nitrogen tank is actually a pressurized liquid nitrogen tank. A liquid nitrogen pump is installed on the mouth of the tank, and a hand-pinch rubber ball is installed on the liquid nitrogen pump. When the rubber ball is pinched, a small amount of  liquid nitrogen is sucked into the vaporization chamber, the volume of which increases due to vaporization, thus to generate pressure so that the liquid nitrogen in the liquid nitrogen tank is discharged.